CN106949090B - Centrifugal fan device with adjustable blades - Google Patents

Centrifugal fan device with adjustable blades Download PDF

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Publication number
CN106949090B
CN106949090B CN201710269476.9A CN201710269476A CN106949090B CN 106949090 B CN106949090 B CN 106949090B CN 201710269476 A CN201710269476 A CN 201710269476A CN 106949090 B CN106949090 B CN 106949090B
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China
Prior art keywords
blade
blades
wheel disc
impeller
uniformly distributed
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CN201710269476.9A
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Chinese (zh)
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CN106949090A (en
Inventor
窦华书
张硕
姜陈锋
毛涵韬
张炜
梁迦贺
许文倩
金同舟
王天垚
贺磊盈
董若凌
赵新龙
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Zhejiang Sci Tech University ZSTU
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Zhejiang Sci Tech University ZSTU
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/002—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying geometry within the pumps, e.g. by adjusting vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/287—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps with adjusting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a centrifugal ventilator device with adjustable blades, which comprises an inner impeller and an outer impeller, wherein a plurality of inner blades are uniformly distributed along the circumferential direction of an inner wheel disc, and a plurality of outer blades are uniformly distributed along the circumferential direction of an outer wheel disc; the inner blade and the outer blade are both in an asymmetric surface wing shape, and floating bulges for reducing the friction resistance of the near wall surface are arranged on the surfaces of the inner blade and the outer blade; the device also comprises a signal acquisition module and a blade row spacing adjusting mechanism; the blade row spacing adjusting mechanism comprises a guide slideway and a traction device. Through the matching of the inner blade and the outer blade, the outer blade can be adjusted to a proper position according to air volume under different working conditions, so that the effect of one machine with multiple purposes of the centrifugal fan is realized, the aim of stable and efficient work under the non-rated working condition is fulfilled, and the cost performance and the efficiency of the centrifugal fan are greatly improved; the asymmetric airfoil blade enables the streamline to flow basically along the blade direction, and airflow loss is reduced.

Description

Centrifugal fan device with adjustable blades
Technical Field
The invention belongs to the field of centrifugal ventilator equipment, and particularly relates to a centrifugal ventilator device with adjustable blades.
Background
Along with the development of scientific technology and modern technology, a centrifugal fan in production and life is regarded as extremely common mechanical equipment and is more and more emphasized by industrial production, the increase of the use amount of the centrifugal fan also means that higher requirements are required for the fan, and the concept of one machine with multiple purposes is a future fan development direction aiming at the current situation of combining the energy situation of China with the current situation, saving energy and reducing consumption; in terms of the working conditions of the fans in the daily industry, a lot of unnecessary loss still exists, and the economic efficiency and the cost expenditure cannot be met, so that the improvement of the fans is imperative.
The centrifugal fan generally works within a certain working condition range in actual production, and the method is a way for saving energy and improving economy by enlarging the working condition range of the centrifugal fan and improving the adjusting capacity of the fan under different loads. To increase the ventilation capacity of the impeller, a row of blades is generally added in front of the impeller. When the centrifugal fan operates under the design working condition, fluid can be well attached to the blade profile, and large separation cannot occur. However, when the centrifugal fan operates under variable working conditions, the airflow angle of the inlet of the inner impeller is not matched with the installation angle, and the blades are impacted. The moving blades in the upstream inner wheel wake are subjected to varying aerodynamic loads whose magnitude is related to the wake decay rate. When the inner impeller is streamlined, the attenuation degree of the air flow wake of the inner impeller depends on the air flow turbulence degree at the inlet and the distance between the inner impeller and the downstream outer impeller. When the distance is smaller, the flow among the blade rows is increased unsteadily, and the flow nonuniformity is increased; when the distance is larger, the mixing distance of the wake and the fluid in the main flow area is longer, the loss is increased, and therefore the optimal distance exists to enable the pneumatic loss to be minimum. In order to avoid stalling or blocking of the centrifugal fan during variable-working-condition operation, the blades can be designed to be adjustable and combined with an electronic technology, so that the blades of the inner impeller and the outer impeller can form optimal matching within the full-working-condition range, the efficient operation range of the fan is expanded, and the operation stability of the fan is enhanced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a double-impeller centrifugal fan device with adjustable blades. The distance between the inner impeller blade and the outer impeller blade is changed to eliminate the influence of the air flow wake of the inner impeller, so that the application range of the centrifugal fan is expanded, and the centrifugal fan can be applied to production and living occasions with wide flow operation range.
The invention is mainly realized by the following technical scheme:
a centrifugal fan device with adjustable blades comprises an inner impeller and an outer impeller, wherein the inner impeller comprises an inner wheel disc and inner blades; the outer impeller comprises an impeller cover, an outer wheel disc and outer blades; the inner wheel disc and the outer wheel disc are supported on the same power input shaft through a bearing; the method is characterized in that: a plurality of inner blades are uniformly distributed along the circumferential direction of the inner wheel disc, one side of each inner blade is fixed on the inner wheel disc, the other side of each inner blade is fixed with the wheel cover, and the number of the inner blades is a value which is rounded upwards after 1/3 of the geometric outlet angle of each inner blade; one side of each outer blade of the outer impeller is matched with the outer wheel disc through a push-pull track, and the outer blades are uniformly distributed along the circumferential direction of the outer wheel disc; the number of the outer blades and the inner blades follows the principle that the outer blades and the inner blades are mutually prime numbers; the mounting rotation directions of the inner blade and the outer blade are the same; the inner blade and the outer blade are both in an asymmetric surface wing shape, and floating bulges for reducing the friction resistance of the near wall surface are arranged on the surfaces of the inner blade and the outer blade;
the device also comprises a signal acquisition module and a blade row spacing adjusting mechanism; the signal acquisition module comprises a probe and a central processing unit; probes are welded in the middle of the inner blade tail edge and the outer blade front edge, the probes are uniformly distributed along the circumferential direction, flow field information such as flow field temperature, pressure and the like monitored by the probes is transmitted to a central processing unit for analysis and calculation, and the central processing unit sends signals to the blade row spacing adjusting mechanism;
the blade row spacing adjusting mechanism comprises a guide slideway and a traction device; the lower end surface of the outer blade is provided with a groove along the radial direction to be matched with a guide slideway of the outer wheel disc; guide through holes are radially distributed on the side of the wheel cover; the traction device comprises a control ring, a connecting rod, a pin and a columnar connecting block; the control ring receives a signal of the central processing unit and drives the columnar connecting block to move along the guide through hole through the connecting rod; the lower end of the columnar connecting block is embedded into the outer blade, so that the outer blade can move along the radial direction.
The invention has the beneficial effects that:
according to the invention, through the matching of the inner blade and the outer blade, the outer blade can be adjusted to a proper position according to air volume under different working conditions, so that the effect that the centrifugal fan has multiple purposes is realized, the aim of stable and efficient work under the non-rated working condition is achieved, and the cost performance and the efficiency of the centrifugal fan are greatly improved; the asymmetric airfoil blades enable the streamline to flow basically along the direction of the blades, so that the air flow loss is reduced; meanwhile, under the action of the floating protrusions on the surfaces of the blades, the flow field of the near-wall area of the blades is changed, the average speed gradient is reduced, the frictional resistance is reduced, and the use efficiency of the centrifugal ventilator is improved; the flexible blade adjusting device ensures that under different working conditions, the influence range of the trail of the inner impeller is smaller, the impact on the outer blade is reduced, the load change of the blade is reduced, and the service life is prolonged; all parts of the device are tightly matched, and the structure is compact.
Drawings
Fig. 1 is a perspective view of the overall structure of the present invention.
FIG. 2 is a schematic sectional view of the overall structure of the present invention.
FIG. 3 is a schematic view of an inner blade of the present invention.
Figure 4 is a schematic view of an outer wheel disk guide runner according to the present invention.
Wherein, 1-wheel cover; 2-outer leaf; 3-outer wheel disc; 4, guiding through holes; 5-control loop; 6-pin; 7-a connecting rod; 8, a columnar connecting block; 9-a main shaft; 10-inner blade; 11-inner wheel; 12-inner wheel guide slide.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the drawings.
As shown in figures 1 and 2, the centrifugal ventilator device with adjustable blades is characterized in that one side of an inner blade 10 of an inner impeller A is fixed on an inner wheel disc 11, the other side of the inner blade is fixed with a wheel cover 1, N 1 The blade blades are uniformly distributed along the circumferential direction, and the number of the inner blades is N 1 =β 2A /3To make an estimation: (β 2A Geometric exit angle of blade), N 1 Taking a value slightly larger than the value; one side of an outer blade 2 of the outer impeller B is matched with an outer wheel disc 3 through a push-pull track, and N is 2 The outer blades are uniformly distributed along the circumferential direction, N 1 And N 2 Following the principle of mutual prime numbers and the number of outer blades N 2 The operating speed n/60 of the x impeller is not equal to the natural frequency of the inner blade so as to avoid causing resonance; the inner blade 10 and the outer blade 2 are asymmetric airfoil-shaped blades, and floating protrusions are arranged on the surfaces of the blades, so that the near-wall friction resistance is reduced.
The blade row spacing adjusting mechanism comprises a control ring 5, a guide through hole 4, a wheel disc guide slideway 12, a probe and a columnar connecting block 8; wherein the wheel cover side is provided with N 2 A plurality of guide through holes 4 in a radial direction; the outer wheel disc side is provided with N 2 A guide chute 12; as shown in fig. 3 and 4, the lower end face of the outer blade 2 is provided with a groove, the depth is from 3mm to 5mm, and the width is about 1/4 of the thickness of the blade; the outer blade groove is matched with the guide slideway 12; the connecting rod 7 is connected with the control ring 5 and the columnar connecting block 8 through a pin 6; the lower end of the columnar connecting block 8 is embedded into the outer blade 2.
The signal acquisition module comprises a probe and a central processing unit; probes are welded at the inner parts of the tail edge of the inner blade and the front edge of the outer blade and are uniformly distributed along the circumferential direction; and transmitting the three-dimensional flow field of the blade channel measured by the probe to a signal processing center, wherein the flow field comprises the flow velocity, the direction, the temperature and the pressure. The central processing unit receives the pressure and flow velocity pulsation signals transmitted by the probe, determines the moving distance of the outer blade 2 through operation processing, sends out a control instruction, and the control ring 5 drives the columnar connecting block 8 to move in the guide through hole 4 through the connecting rod 7, so that the outer blade 2 moves along the radial direction.

Claims (1)

1. A centrifugal fan device with adjustable blades comprises an inner impeller and an outer impeller, wherein the inner impeller comprises an inner wheel disc and inner blades; the outer impeller comprises a wheel cover, an outer wheel disc and outer blades; the inner wheel disc and the outer wheel disc are supported on the same power input shaft through a bearing; the method is characterized in that: a plurality of inner blades are uniformly distributed along the circumferential direction of the inner wheel disc, one side of each inner blade is fixed on the inner wheel disc, the other side of each inner blade is fixed with the wheel cover, and the number of the inner blades is a value which is rounded upwards after 1/3 of the geometric outlet angle of each inner blade; one side of each outer blade of the outer impeller is matched with the outer wheel disc through a push-pull track, and the outer blades are uniformly distributed along the circumferential direction of the outer wheel disc; the number of the outer blades and the inner blades follows the principle that the outer blades and the inner blades are mutually prime numbers; the mounting rotation directions of the inner blade and the outer blade are the same; the inner blade and the outer blade are both in an asymmetric surface wing shape, and floating bulges for reducing the friction resistance of the near wall surface are arranged on the surfaces of the inner blade and the outer blade;
the device also comprises a signal acquisition module and a blade row spacing adjusting mechanism; the signal acquisition module comprises a probe and a central processing unit; probes are welded at the inner parts of the tail edge of the inner blade and the front edge of the outer blade and are uniformly distributed along the circumferential direction, the flow field temperature and pressure flow field information monitored by the probes are transmitted to a central processing unit for analysis and calculation, and the central processing unit sends signals to the blade row spacing adjusting mechanism;
the blade row spacing adjusting mechanism comprises a guide slideway and a traction device; the lower end face of the outer blade is provided with a groove along the radial direction, the depth of the groove is from 3mm to 5mm, the width of the groove is 1/4 of the thickness of the blade, and the groove is matched with a guide slideway of the outer wheel disc; guide through holes are radially distributed on the side of the wheel cover; the traction device comprises a control ring, a connecting rod, a pin and a columnar connecting block; the control ring receives a signal of the central processing unit and drives the columnar connecting block to move along the guide through hole through the connecting rod; the lower end of the columnar connecting block is embedded into the outer blade, so that the outer blade can move along the radial direction.
CN201710269476.9A 2017-04-24 2017-04-24 Centrifugal fan device with adjustable blades Active CN106949090B (en)

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CN106949090B true CN106949090B (en) 2023-03-31

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112746986B (en) * 2021-01-22 2022-11-08 浙江理工大学 Composite blade structure capable of adjusting diameter of short blade

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8662846B2 (en) * 2010-09-14 2014-03-04 General Electric Company Bidirectional fan having self-adjusting vane
JP2016003641A (en) * 2014-06-19 2016-01-12 パナソニックＩｐマネジメント株式会社 Centrifugal fan
CN105715574B (en) * 2014-12-05 2019-03-26 上海电气集团股份有限公司 A kind of guide vane control set for adjusting
CN105756987B (en) * 2016-04-26 2017-07-14 浙江理工大学 A kind of bluetooth far controls the centrifugal ventilation machine device of adjustable vane
CN206738234U (en) * 2017-04-24 2017-12-12 浙江理工大学 A kind of centrifugal ventilation machine device of adjustable vane

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